C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
C21C 1/10 (2006.01)
Patent
CA 2484036
The invention concerns inoculation alloys for treating cast iron castings containing (by wt. %) 0.005 % to 3 % of an element of the group consisting of bismuth, lead and antimony, 0.3 to 10 % of metals of rare-earth group and optionally aluminium up to 5 % and calcium up to 1.5 %, the rest being ferro-silicon, lanthanum constituting more than 90 % of the rare-earth metals contained in the composition. The inventive alloys enable efficient inoculation of cast iron and avoid occurrence of micro-shrinkage cracking in the cast parts. The alloys are conditioned in the form of slugs or powder.
L~invention a pour objet des alliages inoculants destinés au traitement de la fonte de moulage contenant (en poids) de 0,005% à 3% d~un élément du groupe bismuth, plomb et antimoine, de 0,3 à 10% de métaux de groupe des terres rares et éventuellement de l~aluminium jusqu~à 5% et du calcium jusqu~à 0,5%, le reste étant du ferro-silicium, le lanthane constituant plus de 90% des métaux des terres rares entrant dans sa composition. Les alliages selon l~invention permettent une inoculation efficace de la fonte et évitent l~apparition de micro-retassus dans les pièces moulées. Les alliages sont conditionnés sous forme depions soit en poudre.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Pechiney Electrometallurgie
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